Soluble inclusion complex comprising one or several active substances difficult to dissolve in aqueous medium including one or several host molecules and piroxicam-cyclodextrin-arginine in which the level of solubilization of piroxicam in solution containing 4 g/liter piroxicam in water, measured at 37[deg]C with agitation over 5-120 minutes is higher than 90%, most especially higher than 99%. INDEPENDENT CLAIM are included for: (1) preparation of the complex involving:contact with host molecules, initation of molecular diffusion, recovery of the soluble inclusion compound formed (2) a pharmaceutical composition containing the complex.
